Ar-Ar Age Dating

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Argon-argon dating - Wikipedia
K-Ar dating - Wikipedia
PDF 17 K-Ar and Ar-Ar Dating - University of Arizona
Ar-Ar and K-Ar Dating | SpringerLink
Potassium-Argon Dating Methods: K-Ar and Ar-Ar Dating
Ar-Ar dating
Services | OSU Argon Geochronology Laboratory
Potassium-Argon and Argon-Argon Dating of Crustal Rocks . . .
Argon Geochronology Methods
Argon-Argon Age-Dating
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Argon-argon (or 40 Ar / 39 Ar ) dating is a radiometric dating method invented to supersede potassium-argon (K/Ar) dating in accuracy . The older method required splitting samples into two for separate potassium and argon measurements, while the newer method requires only one rock fragment or mineral grain and uses a single measurement of argon isotopes .
Ar-Ar dating is a similar technique which compares isotopic ratios from the same portion of the sample to avoid this problem . Applications . Due to the long half-life of 40 K, the technique is most applicable for dating minerals and rocks more than 100,000 years old . For shorter timescales, it is unlikely that enough 40 Ar
Apollo 11 mission, Ar-Ar provided a crucial dating technique . Some samples were dated using K-Ar and yielded ages in the broad range 3 to 4 Ga, testifying to the antiquity of the lunar surface, although this much had been estimated from crater densities . In contrast, the Ar-Ar dating technique provided a wealth of precise ages and thermal histories .
An absolute dating method based on the natural radioactive decay of 40 K to 40 Ar used to determine the ages of rocks and minerals on geological time scales . Argon-argon dating . A variant of the K-Ar dating method fundamentally based on the natural radioactive decay of 40 K to 40 Ar , but which uses an artificially generated isotope of argon ( 39 . . .
The potassium-argon (K-Ar) isotopic dating method is especially useful for determining the age of lavas . Developed in the 1950s, it was important in developing the theory of plate tectonics and in calibrating the geologic time scale .
www .mantleplumes .org › ArAr .html
The proliferation of 40 Ar / 39 Ar dating laboratories has led to a large number of papers reporting age data . However, in many instances, the published " ages " have no merit, as they fail the simple statistical tests that should be applied to all such data .
geochronology .coas .oregonstate .edu › services
If you are interested in getting your samples age dated using the 40 Ar / 39 Ar age dating method, then follow the instructions on the Services page . CEOAS Facility Our facility has been an integral part of the College of Earth, Ocean and Atmospheric Sciences at Oregon State University since 1977 .
According to the assumptions foundational to potassium-argon (K-Ar) and argon-argon ( Ar-Ar ) dating of rocks, there should not be any daughter radiogenic argon (40 Ar *) in rocks when they form . When measured, all 40 Ar * in a rock is assumed to have been produced by in situ radioactive decay of 40 K within the rock since it formed .
The 40 Ar / 39 Ar dating technique is a more sophisticated variation of the K/Ar dating technique . Both techniques rely on the measurement of a daughter isotope ( 40 Ar ) and a parent isotope . While the K/Ar technique measures potassium as the parent, the 40 Ar / 39 Ar technique uses 39 Ar .
www .diggles .com › bturrin › 40Ar .html
The most significant advantage of the 40 Ar / 39 Ar dating method over the conventional K-Ar method, however, is the ability to step-heat samples to higher and higher temperatures until the sample is fused, and calculate and ages for each step . The 40 Ar / 39 Ar step-heating method provides information on the internal systematics of potassium and argon (ie the internal distribution of potassium relative to argon) .
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Ar-Ar Age Dating